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MARKER-ASSISTED BREEDING in APPLE, PEACH, & CHERRY TARGETS VALUABLE FUNCTIONAL ALLELES

MARKER-ASSISTED BREEDING in APPLE, PEACH, & CHERRY TARGETS VALUABLE FUNCTIONAL ALLELES. Cameron Peace, Washington State University

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MARKER-ASSISTED BREEDING in APPLE, PEACH, & CHERRY TARGETS VALUABLE FUNCTIONAL ALLELES

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  1. MARKER-ASSISTED BREEDING in APPLE, PEACH, & CHERRY TARGETS VALUABLEFUNCTIONAL ALLELES Cameron Peace, Washington State University with: Nahla Bassil, Michael Coe, Gennaro Fazio, Karina Gallardo, Ksenija Gasic, Jim Luby, Dorrie Main, Jim McFerson, Cholani Weebadde, Eric van de Weg, Chengyan Yue, & Amy Iezzoni

  2. Outline of Presentation • The RosBREED Project • Available “Jewels in the Genome” • Jewels in Breeding Application • What’s Next? RosBREED 2

  3. The RosBREED Project

  4. The RosBREED Project • Goal: Enable MAB for U.S. Rosaceae crops • PI: Amy Iezzoni, Michigan State University • 4 years, Sep 2009 – Aug 2013 • Funded by SCRI(USDA-NIFA’s Specialty Crop Research Initiative) • $14.4 M ($7.2 M SCRI, $7.2 M in-kind Partners) • Collaboration U.S.-wide and international

  5. “Jewels in the Genome” - discovering, polishing, using QTL discovery(looks promising...) MAB Pipelining(polishing...) Breeding(assembling into masterpieces) Jewels = valuable genetic discoveries ready for breeding application = marker-locus-trait associations validated in a breeding program

  6. Application of Genomics Knowledge Expression profiles Find trait-controlling genes Known QTLs Linkage maps Application in current cultivars DNA information Application Genetic/allelic diversity Application in breeding Whole genome sequences GMO

  7. Application of Genomics Knowledge Expression profiles Find trait-controlling genes Known QTLs What DNA information is available? What is the practical goal? Various waysto get there Linkage maps Application in current cultivars DNA information Practical application Genetic/allelic diversity Application in breeding Whole genome sequences GMO

  8. Application of Genomics Knowledge Known QTLs QTL priorities DNA testing services Breeding markers Simple validation Allele effects& distributions Crossing schemes Application in breeding Seedling selection schemes Trial MASS

  9. Application of Genomics Knowledge Known QTLs QTL priorities DNA testing services Breeding markers Simple validation Allele effects& distributions Crossing schemes Application in breeding Seedling selection schemes Trial MASS

  10. Application in Breeding - Requirements Tool utility = predictive power in germplasm of a breeding program Tool itself = assay (DNA markers) usable by a breeding program

  11. Application in Breeding - Requirements Tool utility = predictive power in germplasm of a breeding program Tool itself = assay (DNA markers) usable by a breeding program • ready-to-usemarker-locus-trait associations • DNA tests for contrasting alleles at locifor valuable traits

  12. Application in Breeding - Requirements Tool utility = predictive power in germplasm of a breeding program Tool itself = assay (DNA markers) usable by a breeding program Idiosyncratic! One size does not fit all! • ready-to-usemarker-locus-trait associations • DNA tests for contrasting alleles at locifor valuable traits ...all breeding-program-specific

  13. Available“Jewels in the Genome”

  14. Available “Jewels in the Genome” Fruit color Fruit color Bitter pit susceptibility Red stele resistance “Fresh sensation”(crispness, tartness, juiciness) Sweetness & acidity Fruit storability Ever-bearing Fruit size Acidity Sunburn susceptibility Leaf spot resistance Self-fertility Fruit skin color Firmness Fruit size Freestone vs. clingstone Maturity date Melting vs. Non-melting flesh

  15. Strawberry: Red Stele Resistance Red stele resistance Is presence of certain SSR allele associated with red stele resistance? • Validation of marker by inoculations: • - 75% match genotype-phenotype- 20% individuals have other resistance sources 0 1 2 3 4 5 3.43disease threshold • Genotypic data also used to identifymany cases of incorrect parentage Marker(s)? 1 SSR • Application? Parents: crossing Seedlings: culling Selections: advance

  16. Apple: Skin Coloration Cover amount over apple skin surface Allele & Genotype frequencies in 192 cvs probability 1000 seedlings – how many with score >4? Rfrf x RfRf ---> 647 RfRf x RfRf ---> 818 rf rfrf Rf RfRf +26% efficiency! Rfrf Marker(s)? 1-3 SNPs from 8K array genome scan Application?Parents: crossing Selections: distinguish Rfrf / RfRf

  17. Peach: Maturity Date One trait locus,two ways of genotyping Two SSR alleles(168,156) in two combinations Three 2-SNP haplotypes (AA,GA,AG) in four combinations GA:AA AA:AG 168:168 156:168 AA:AA GA:AG -40 -20 +40 days -40 -20 +40 days 20 July +20 20 July +20 Maturity date Marker(s)? 2 SNPs from 9K array ...or ... 1 SSR • Application?Parents: crossing Seedlings: culling Selections: advance

  18. Apple: Acidity • Two lociMa – LG16“A”– LG8 Acidity • Not quite additive – some epistasis •  Use together Marker(s)? 2 SNPs from 8K array genome scan Application? Parents: crossing Selections: distinguish low/med/high

  19. Apple: Multiple Traits Around Ma Locus Bitter pit susceptibility cM Mb 0 0 “Fresh sensation”(crispness, tartness, juiciness) 5 Ma 16 2 10 15 Fruit size 4 Target B? 20 Maturity date 25 6 30 L L • Every individual has 2 haplotypes Target A? Honeycrisp Golden Del. Braeburn Gala Pink Lady L E L L L L Marker(s)? 1 SSR Application?Parents: crossing Seedlings: culling Selections: advance

  20. Cherry: G2 Fruit Size and Firmness– An Economic Trade-Off Socio-economic value ($ per lb) G2 locus haplotype G2 locus diplotype BL AL L 0.10 SE value = value of reaching thresholdxprobability of achieving it 0.08 CE Fruit size 0.06 BE E C AA Population average A 0.04 AB B AE AD AC Firmness D 0.02 BD H AH F AF m 0 Am AN BNBm N O Marker(s)? SSRs – 2 flanking the QTL Application?Parents: crossing Seedlings: culling Selections: advance

  21. Jewels in Breeding Application

  22. Marker-Assisted Seedling Selection in the Washington Apple Breeding Program “Fresh sensation”(crispness, tartness, juiciness) Fruit storability • estimated projected resource savings Cost per initial seed 2010 2011 2012 Savings $62K $38K $60K $10 Rearing & evaluating those kept seedlings tested $8 8000 5417 7452 $6 DNA testing seedlings culled $4 5000 2937 4403 Early rearing $2 $0

  23. What’s Next? RosBREED 2

  24. A Planned New RosBREED Project CONSUMPTION MARKETING PROCESSING PRODUCTION Innovative, superior,risk-mitigating new cultivars Cultivar commercialization Post-breeding Socio-economics information Seedling selection Parent selection Efficient, accurate, creative breeding Breeding DNA information Accessible natural diversity Pre-breeding Germplasm development NATURAL DIVERSITY

  25. Acknowledgements This project is supported by the Specialty Crop Research Initiative of USDA’s National Institute of Food and Agriculture

  26. Questions?

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